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Transmitted Sound Field Calculation and Optimization of Beampattern for Torpedo Conformal Array

Author: ZhangJun
Tutor: ChenYaLin；LvLinXia
School: China Ship Research Institute
Course: Underwater Acoustics
Keywords: Conformal array Sound field calculation Boundary Element Method Transmit beam optimization
CLC: TJ635
Type: Master's thesis
Year: 2011
Downloads: 22
Quote: 0
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Abstract


Acoustic emission properties of the arrays is an important factor in the impact of the initiative torpedo homing system detection capability . Compared with the planar array , the three-dimensional conformal array having a good receiving and transmitting capability requirements within the large fan , but because of the irregular baffle plate , the array element between mutual radiation large declination, high source - level characteristics , restriction the conformal array transmit beam performance. Therefore, the analysis and calculation of the conformal array transmit sound field , looking for ways to improve the performance of its launch has important theoretical significance and application value . The analytical method is difficult to do an accurate description and calculation , the irregular structure of conformal array acoustic radiation numerical radiation calculations and emission properties of the sound field to solve optimization problems . The papers on the basis of the boundary element theory , with the boundary element software torpedo conformal array transmit sound field boundary element numerical model and optimize the transmit beam conformal array transmitter performance improvement . Specific studies include : ( 1) gives the boundary element method calculation conformal array transmit sound field . Finite baffle 52 element planar array , the the the 36 yuan spherical array and 36 yuan cylindrical array of boundary element acoustic numerical model to calculate their unit directional sound pressure distribution of near-field and far- field directivity . The calculation results show that the numerical method may take into account the mutual coupling and the baffle plate between the picket its emission of the sound field to obtain a more accurate calculation result . (2) gives the conformal array beam optimization mathematical model . Based BEM beam optimization method and the beam optimization method based on the measured array manifold , the use of a second norm minimum and maximum least constraint conditions to obtain an optimized weighting coefficient , effectively reducing the sidelobe level of the transmit beam of the conformal array . , improved emission directivity index . (3) the pool of conformal array validation experiments . In the different beam control angle of the plurality of frequency measurement beam conformal array conventional beam and optimization , validate the calculation model of the boundary element acoustic beam to optimize the validity of the models and methods .

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CLC: > Industrial Technology > Arms industry > Underwater weapons > Torpedo and its launcher > Torpedo launcher
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